The discovery of the phenomenon of synchroniza� tion of chaotic oscillations between interacting dynamical systems [1] made possible the development of new methods of hidden data transmission based on the use of various types of chaotic synchronization (identical, lag, phase, generalized, etc.) [2–9]. Various schemes of transmitting informative signals using the synchronization of chaotic dynamical systems have been proposed, including chaotic masking [2], switch� ing of chaotic regimes [3], nonlinear mixing of infor� mative and chaotic signals [4], modulation of trans� mitter parameters in combination with adaptive recept [6], etc. However, it turned out that many communi� cation systems employing chaotic signals can in fact